Screw driver



F. V. BORICK.

SCREW DRIVER. APPLICATION FILED JUNE 4, 1920.

Patented July M, 19.22;,l l

is. 1 l V Inventor: FRANK V BORICK Atty erre

igeaaeiii y Applicationledl .Tune 4,'

TO all whom t may concer/n Be it known that L FRANK. V. Bomen, a'

. citizen of the United States.` residing. at New York'. city, in the county of New Yorlr'an'd State of New Yorkph'ave invented 'certain new and useful-f lmprovements'- in Screw Drivers, of 4which the following. `is Va specification.

This invention relates to improvements inr spiral tool drivers and is vmore particularly. applicable to screw-drivers, which .rotate in operation. r r

The-principal object of the invention is t0 provide an elficientlyl operatingdevice .ofi

this characterl.-V wherein the number'of Aparts employedy is reduced to a minimum,.tliereb7v` accompanying y drawing,y wherein- Fig.. 1 is a vertical sectinalelevation of theimproved tool driver.

Fig.` 2is an enlarged eleva-tion,` partly in section of the lower or tool holder end of the device, the handle being. raisedand the chuclr released.

Fig'. 3 is a horizontal section taken on the line 3 3 oflFig. 2`v looking' `in the direction of the arrows; and

Fig'. 4r is a perspective view of the loose member of the clutch.

Referringto the drawing, the device comy prises .tubular casing; 10 theslower, end` of which' is provided with clutch teeth 11 and theupper endv of which is rigidlygsecured within a therethrough. Theexposed portion ofthe pin affords a seat against which a cup shaped member 141: contacts, said member 14; bearing against the inner wall of the tube. The-member 14 has a squared central openingr and is provided with flange 15 adapted to receive the squared end 16 of a tool rod orspindle, a spot weld shown at 17 assuring a permanent connection between the two members. rEhe cup shaped member provides a guide for the reciproeation and rotation of the tool rod. The depending; portion of said tool rod is twisted to form a spiral 18,

the extreme lower end of which, projecting below the tube, being round as at 19. An inwardly projecting annular bead 2O of the tubular member limits the outward travel of the rod 18, by contact of the cup member specification of Letters Patent. f

handle 12 by a pin 13 inserted.

Patented faery -i ieee; i920; semaine. 336,454. l

1&1 with" said bead.` Mountedv about the said rod 418,' andadjacent the teeth of thetubell,Y

isa cup shaped clutch member 21 provided with inwardly. projecting` clutch-teeth 22',

similar. in lshape and number to the teeth 11. i

The teeth 11 and `22are circularly arranged `around. the periphery f of their respectiveparent Vmembers andare adaptedvto benormal ly held in contact `by the pressureexerted by a spring` 23`actingagainst the; bottom.V of

the member 21j which isprovided `wit-har squared central flange 24. It isrto be noted that when jthe pressure ofthe spring-23 is overcome themember V21will be free to rotate.

A cylindrical shell or-ferrule-2-5 is placed over the end of thetubular member 10' retainingthe part 21 vin itsrelation to the tube 10 an d .affording a sseat for the lower end of the spring :23. The upper end of the shell or ferrule member 25 engages the groove I formed onthe outer surface of the tube by the cireularbead 2O before referred to. TheV engagement of the upper edge of the ferrule 25 in the groove makes it impossible for the member to be slipped oft.

Any suitalile tool holder may be provided suoli as that shown in the drawing. I prefer a type wherein the shank. of a chuck 26 is rigidli7 connected, preferably by spot weldine(` as shown at 27,v to the projeetingportion 19 ofthe tool rod member 18. The said shank is also embraced b v a spacing washer 28 Vwelded thereto at 29 and a Q;rip sleeve 30 loosely mounted thereon between `said washer and shoulder 31 on` the head of' the chuck. The chuck member 26 'is longitudinally.split in theusual manner-,and adapted` to receive a knurled nut 32closinthe igrip on a suitable` tool 33. .lt will be noted that the end .19 of the tool rod is recessed or bifurcated to receive the end of a preferably double en ded tool.

To operate the tool, it is necessary to pull out the tool rod 1G until the cup member 11iattached thereto, is stopped by contact with the bead 20. ln doing' this the tool rod will rotate freely throughout its travel of the tubular casing; 10. The cup shaped clutch member 21 will remain stationary beine' held in engagement with the clutch teeth 11 of the tube 10 by the spring 23. Therefore, as the spiral portion of the tool rod is pulled through the member 21 a rotatory action is imparted to the tool rod. The reduced portion of the tool 33 is then placed into the slot in the head of the screw, about to be driven. and a downward pressure exerted upon the handle 12. By this action the tubular member l0 will be forced down over the tool rod` and as the cup shaped clutch member 2l is still held against rotation the tool rod will be forced to rotate by reason of its extension through the squared opening 24; on the clutch. This operation will continue until the cup guide member 14 contacts with. the stop pin '13, projecting across the handle and upper end of the tube.

vmember 2l to move downward and away from the teeth 11 of t-he tubulal` member, disengaging the teeth 22 and 11. This operation will permit the clutch member 21 to rotate'freely between the ierrule. and the toothedportion of the tube. rEhe upward pulling of the handle and tube will continue until the cup guide lll` again is engaged by the bead 20. The yabove described several operative steps may be repeated'until the driving operation is completed.

Should it be desired to operate the tool in the manner of an ordinary screw driver, i` eL without employing the spiral driving'. device the tool is permitted to remain closed, or in other words the tool rod will not be withdrawn from the tubular member. As the teeth lland 22 of the clutch member are rectangular in shape having straight vertical interengaging sides, there will be no independent rotation of either member until the cup shaped clutch member 2l is forced down away from the teeth 11 of the tube 10.

It has been found in practice that the spring 23 may be eliminated from the structure. It will be noted that the inward movement of the spiral portion of the tool rod through the clutch member 21 will compel an upward vertical movement of the latter clutch member` causing the same to remainv in engagement with the teeth 11 of the tubular member. This action is the reverse of that noted above, relating to the vertical disengaging of said clutch members by the rot-atory action of the spiral upon the clutch member 21. e

In a spiral` tool driver, the combination of a tubular member terminating at its lower end in a series ot projections provided with parallelstraight side edges disposed axially thereof, a handle attached to the opposite end or' said member, a spiral spindle composed otsquare material extensible in said tubular member, a ferrule enclosing the end of the tubular member having the said projections, the said terrule being provided with an openingto receive the spindle therethrough and having its closed end spaced substantially away from the adjacent endof the tubular member, a complemental spring actuated member movable axially and rotap tably within said terrule and having' upstanding projections similar to the rst named projections and adapted to be received by the latter, whereby rotation of the tubular member in either direction will cause a corresponding rotary movement of lthe complemental member, the latter member being provided with an upstanding central sleeve having a through square bore to embrace the veo walls of said spindle, whereby axial movement of the spindle and tubular member relatively to each other will cause'the projections oi the complemental member to remain in engagement with the projections of the tubular member when the tool is collapsed to drive a screw and to move the complemental member axially and then rotatably to dis'engage the said projections when the tool is extended.

In testimony whereof I have affixed myy signature.

FRANK V. BORICK. 

